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Old 3rd March 2013, 01:44 PM   #1611
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Good that the PSU works.
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Old 3rd March 2013, 01:47 PM   #1612
Salas is offline Salas  Greece
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Is it the alternative fast transistors that tamed it or is it something with the lytics being bypassed several times over the long phono rails introducing tank circuits that help setting it off? Just a thought.
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Old 3rd March 2013, 02:46 PM   #1613
hesener is offline hesener  Germany
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Quote:
Originally Posted by Nick77 View Post
Sorry these aren't lite up, i dont have a lab supply or test equipment. They are being shipped off to a buddy to lend a hand, unless someone in Austin Tx can help me out.

Cant wait to hear these, thanks to all.......
Very nice! Just out of curiosity, what are the blue caps you use in the RIAA section?
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Old 3rd March 2013, 03:38 PM   #1614
FdW is offline FdW  Netherlands
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Originally Posted by Salas View Post
Made a PSU unit with 2SA1930/2SC5171 TOSHIBA VAS grade BJTs. PMOS IRF9610 NMOS IRF610. 10uF caps = Nippon KMQ 100V 105C. 100uF caps = Nippon KY 25V 105C. Vin-Vout for reaching 140mA CCS (load demand will be 70mA per rail) = 7V. Rise above ambient on sink behind the power semis = 26C (48C with 22C room temp). Drift = -90mV over settling time = 20 minutes. No parasitic oscillations whatsoever. I.e. this PSU build is stable on its own before connected to its target load.

Notes:
1. Preparing and aligning the sink is a royal PITA.
2. Its sinking capacity is borderline. I would stay +6V to +7V Vin at most. I.e. 2X18VAC should do.
3. Is there statistical info about using the several 1uF film caps on the phono rails or not when oscillations happened?
4. Use short path to ground when probing for oscillations.
First of all, I’m very happy that the PSU works as intended

About the notes:
1: Yes it’s known (Sorry for that) but they look great.
2: Yes, again it’s know but the advised transformer voltage (with no pre-PSU that includes damping is, as you note) 18Vac, giving 24 to 25Vdc on the PSU.
3: That may be a point where we need to improve the design a bit, it would be better, in hindsight, to add a few 10 Ohm resistors in the opamp supply lines (as I normally do) (see attached schema partial).
4: Yes

Your experience makes me think that we have to change the specification for the power transistors. Let’s see what happens when the RIAA is connected.
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File Type: png Opamp PSU decoupling.PNG (11.6 KB, 247 views)
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Old 3rd March 2013, 04:26 PM   #1615
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Salas View Post
Is it the alternative fast transistors that tamed it or is it something with the lytics being bypassed several times over the long phono rails introducing tank circuits that help setting it off? Just a thought.
Well, I avoided the film bypasses on the lytics and it worked...
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Old 3rd March 2013, 05:09 PM   #1616
FdW is offline FdW  Netherlands
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2: Yes, again itís know but the advised transformer voltage (with no pre-PSU that includes damping is, as you note) 18Vac, giving 24 to 25Vdc on the PSU.
Meaning to say, any temperature below 60c, in a 20c environment, is acceptable for me, but may be seen as a little bit high by others . That will lead to 80c in a, high summer, 40c environment (may be seen as borderline, but 40c environment is also borderline (do not switch on those big class-A power amps ).
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Old 3rd March 2013, 05:10 PM   #1617
FdW is offline FdW  Netherlands
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Well, I avoided the film bypasses on the lytics and it worked...
You are saying, you did not stuff C91, C92 and C93? Or you did not place C93 (but placed C91 and C92)? Just to be clear on this.
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Old 3rd March 2013, 05:12 PM   #1618
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Salas View Post
Is it the alternative fast transistors that tamed it or is it something with the lytics being bypassed several times over the long phono rails introducing tank circuits that help setting it off? Just a thought.
Maybe this could be tested by not stuffing C91, C92 and C93, then (when tested) add C91 and C91, and then after testing, stuff C93. WOuld you do that?
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Old 3rd March 2013, 05:20 PM   #1619
Salas is offline Salas  Greece
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Let’s see what happens when the RIAA is connected.
Will let you know about that soon. I will use no 1uF caps on the rails. Only C93 is already there, across not on, of course for the integrator. And I can remove that if something will ring so to see about it.
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Old 3rd March 2013, 05:26 PM   #1620
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by FdW View Post
You are saying, you did not stuff C91, C92 and C93? Or you did not place C93 (but placed C91 and C92)? Just to be clear on this.
I used C93 0.1u ok (No C91 or 92)
Just did not bypass C3 C4 C6 C7
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Last edited by RCruz; 3rd March 2013 at 05:30 PM.
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